Brännvidderna

Brännvidderna, also known as the *Burning Mountains* or *Burning Hills*, is a natural phenomenon located in the Swedish province of Värmland, near the village of Torsby. The site consists of a series of small hills and ridges that have been naturally ignited by underground methane gas emissions, causing them to smolder intermittently. The flames have been observed for centuries, with historical records dating back to the 16th century.

The phenomenon occurs due to the slow oxidation of pyrite (iron sulfide) and other sulfur-rich minerals in the bedrock, a process known as spontaneous combustion. When these minerals react with oxygen, they release heat and gases, including methane, which can ignite and sustain low-intensity fires. The flames are typically visible at night and can last for days or even weeks, depending on environmental conditions such as wind and humidity.

Brännvidderna has been a subject of local legend and folklore, often associated with supernatural explanations. Some believed the flames were caused by the breath of dragons or the work of trolls, while others linked them to Viking rituals or celestial phenomena. Scientifically, however, the phenomenon is attributed to natural geological processes rather than mystical causes.

Today, Brännvidderna remains a rare and fascinating natural wonder, drawing visitors interested in its unique geological and historical significance. The site is protected and monitored to preserve its natural state, though access may be restricted to prevent disturbances. The phenomenon serves as a reminder of the dynamic forces shaping Earth’s landscape and the enduring mystery of natural occurrences that have captivated human imagination for generations.